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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 372 (Engine Controls - System & Component Testing - 3.4L) >> Fuel Systems >> Fuel Pump Electrical Circuit Diagnosis (Impala & Monte CARLO) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is turned to RUN or CRANK position, the Powertrain Control Module (PCM) will turn ON the in-tank fuel pump. The in-tank fuel pump will remain ON as long as the engine is cranking or running and the PCM is receiving reference pulses. If there are no reference pulses, the PCM will turn the in-tank fuel pump OFF 2 seconds after the ignition is turned to RUN position or 2 seconds after the engine stops running.

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